Selective telephone system



H. C. M. HASTINGS. SELECTIVE TELEPHONE SYSTEM. APPLICATION FILED NOV. 28. 1913. RENEWED NOV. 6. 1920.

Patented Oct. 4, 192

7 SHEETS-SHEET I.

Attorneys Patented Oct. 4, 1921.,

7 SHEETS-SHEET 2. v

Attorney R; c. M. HASTINGS SELECTIVE TELEPHONE SYSTEM. APPLICATION FILED NOV. 28. I913. RENEWED NOV. 6. 1920. 1,392,762.

Patented Oct. 4,1921.

7 SHEETSSHEET 3.

Attorneys R. C. M. HASTINGS. SELECTIVE TELEPHONE SYSTEM. APPLICATION F'ILED NOV. 223, 19x3. RENEWED NOV. 6. 1920.

Patented Oct. 4, 1921.

7 SHEETS-SHEET 4.

R. C. M. HASTINGS.

SELECTIVE TELEPHONE SYSTEM. APPLICATION man NOV. 28, 19x3- RENEWED NOV. 6; 1920.

Patented 00$. 4, 19212.

7 SHEETSSHEET 5- k m mwm MEN if 5 2 M I ventor Attorneys R. c. M HASTINGS. SELECTIVE TELEPHONE SYSTEM. APPLICATION FILED NOV. 28, I913- RENEWED NOV. 5. I920.

Patented Oct 4, 1921., 7SHEETSSHEET6.

swea,

55 5- Inventor Attorneys R. c. HASTINGS. SELECTIVE TELEPHONE SYSTEM.

APPLICATION FILED NOV. 28. i913- RENEWED NOV. 6,1920.

1,392.,76Q, Patented; Oct. 4, 1921.

7 SHEETS-SHEET 7 I III! III ff; V

J ,L/ZEZZZ/MWXMQMW Attorneys I scams o. as. HASTINGS, or corms-tens, on o, Assmnoa so iqu'rn'annuionaa i To all whom it may concern rnonln COMP NY, or conunsus, onio.

i sntnon 'ivn 'rnnnrnonn s asrras.

' Specification of Letters meta.

Application filed m'ovember 28, 1913, Serial No. 803,598. aRenewerl .dovemher 6, 1920. Serial No. 422,364.

Be it known that I, RUBEN Hlisr- 1NGs,a citiz'enof the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented a new and-use: ful Selective Telephone System, of which the following'is a specification. I

Th present invention'relates to improvements in selective telephone systems, one obect of the present invention being the provision of a system,,in which peculiar mecha- .IllSIIlS are disposed in all substatlons, whereby the substations may be shunted from the line, and'also whereby the called substation may be signaled through the call-up alarm,

whether the receiver is upon or off the hook,

there being provided in. the present system I automatic shunting-receiver hook locking,

selecting and signalingmechanisms to control the various elements and instruments employed, the selecting being entirely. underthe supervision and control of the exchange operator as inmy formerPatentNo.1,061,285

granted to me May 13, 1913; the selecting key in the present case being identical with the structure set forth in my U. S. Patent No. 1,061,286 granted to me May 13, 1913.

A further object of the'present invention, is the provision of a selecting disk embodying some of the features of the selecting disk shown in myU. 3. Patent No. 1,062,004,

granted to me May 20, 1913, such disk con structed and arranged, as to control the shunting switch and other switches controlled by the shunting switch to permit of v the signaling of the called substation Whether the receiver is upon or off the hook, and also to control such substations regardless of the position of the receiver, the same PI'OVlding a means wherebya subscriber at a substation intending to steal cannot communicate with the exchange, but can be communicated with by the exchange so as not to penalize a calling subscriber when such steal ing sub statlon is desired by a person at a calling substation.

Astill further "object of the present inven tion is the. proyision of-a mechanism at the substation, whereby a subscriber, who attempts to steal a conversation is automatically shunted from the line, and yet at the same time is placed in such a position as to be called or connected by the exchange station for the proper connection with a calling subscriber, such shunted substation being prevented from calling or talking to any stat'ion except the exchange station, but being in a position to be talked to by the exchange op- Pa-tented (Dot. 4-, 1921.

erator, thus permitting and making it pos- U sible for theexchange operator to notify such stealing substation to place the receiver upon the hook and thus establish the proper v the selecting key disposedfat the exchange station. v v

A still further object of theinventionis the provision of a'visual,- non-audible busy signal adapted to be displayed at the substations so as to notify at a glance whether or not the line is in position for calling the exchange station, the same. being preferably a small low voltage, lamp circuit connected toa low voltagebattery in each substation and havinga switch in circuit controlled by the mechanism at such substations. r With the foregoing and other objects in view which will appear asthe description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changesin thepreciseembodiment of the v invention herein disclosed can be madewithin the scope. of what is claimed without departing from the spirit of' the invention. In the drawings- Figure 1 is a diagrammatic view showing an exchange and a single substation installed according to and embodying the present invention, magneto machines being used in the substations for controlling the signal at the exchange station, the parts being in nor- .mal or zero position so-that any one of the substationscan call the exchange.

Fig; 2 is a'sirn ilar view to Fig. 1 showingthe parts. inposition when a-calling substation is communicating with the exchange station, the medium dark lines indicating the flow of current to the line and the signal- -ingdevice at the exchange station.

ig. 3 isa View similar to Fig. 1 showing the, use of an alternating current call-up alarmgenerator installed at the exchange station, and whereby the signal at the exchange station is operated due to the removal of the receiver from the hook in any one of the substations:

Fig. 4 .is a similar view to Fig.3 showing the parts in the position they assume when a calling'substation is connected to the ex- "partly. in elevation of a desk instrument outfit, showing the present substation controlling mechanism located and carried within the base thereof.

Fig. 6 is a top plan view ofthe substation controlling mechanism taken on line 66 of Fig. 5.

Fig. 7 is a section taken on line 77 of Fig. 5. i I

Fig. 8 through 17 are diagrams of the periphery of the switch controlling disk in Various positions.

Figs. 18, 19, 20 and 21 are detail views of various positions of the controlling device and shunt switch. a

Fig. 22 is -a detail perspective view of the switches controlled by the receiver hook and ltS IOCl.

Fig. 23 is a sectional view of the base of the desk instrument showing the visual busy signal lamp.

1 Figs. 24 and 25 are enlarged detail views of the mechanical means for placing the shunt switch in shunt operating position by means of the receiver hook rod;

Figs. 26 and 27 are similar views of a modification.

In order to more fully understand the present invention, the detailed description of the controlling disks 36 and 37 and their operation, and the shunt switches or contacts 38 and 39 will be set forth. The disk 36, which is the main disk for controlling the shunt switch and the other switches --therefrom, is provided with the three ridges a, b and a, and two grooves 54 and 58, this disk and the switch 3838 constitutes the shunting means to shunt the substation S from the line L-L when necessary, being i operated from the exchange through the instrumentality of the selecting key K at the exchange station E and providing a means for automaticall shunting from the line, the uncalled substations and connecting for communication the called substation .with the calling substation for aprivate'or non-interfering convelsation, the operation of the disk 36, as will presently appear, being completelyand solely under the control of the selecting keyfrom the exchange station.

More clearly set forth the construction and operation, the description will follpw the operation in starting with the asking b a calling substation of the exchange, an tli e connection by the exchange of a called substation. To therefore clearly describe the operation, we will presuppose that the subscriber at substation No. 1 is calling for subscriber at substation No. 5,. allaf the disks 36 at this time being at what is?termed zero position, with'all pins 38 Lcarried by the shunt contacts 38 disposed at. position 60 and .as clearly illustrated in Figs. 8 and 9 of the diagrams of the periphery of such disks 36. Thus the ridge a. at such point will engage the pin 38 and hold the shunt contacts downwardly against the tension of the spring 41, the detailed construction and arrangement of which will presently In the diagram as shown in Figs. 1 and 2,

themagneto machine A is operated at the substation No. 1. Before the receiver R is removed from the hook 25, the signal 9 at the, exchange is energized by operating the magneto A to indicate to the exchange that a substation is calling. The exchange operator inserts the answering jack plug 1 in the socket 14, .and thus is connected to the line for responding to the signal of the calling substation, and such calling substation as before assumed asks to be connected with substation No. 5. f

The selecting key, as described in my U. S.

Patent No. 1,061,286, above referred.to, is. manipulated. as therein 'set forth to select the instrument No. 5 and thus automatically,

this action as will presently appear, causes the closure of a circuit to the call-up alarm 81 in substation No. 5 and consequently the signaling ofsuch substation, all disks 36 in the various substations being'actnated by the step-by-step motion imparted to the shaft 35 of the disks 36 and 37 through the instrumentality of the electro magnet 29 which is connected at all times in circuit with the line L--L, the circuit of which will be descrbed in. full later on. Thus all of the disks 36 in every substation are caused to automatically be moved five positions, andas substation No. 5 is the one selected, all of the pins 38' of the substations except the pin 38 in the substation N0. 1, pass into the groove 54 when the substation No. 5 is selected, while at substation No. 1, the pin 38- stands under the ridge a. Thus all of the pins 38' except the one atthe calling substation No. 1 are caused to pass through the respective spaces 55 and consequently enter' the respective grooves 54, this being due to the fact that the receivers were upon the hooks and the spring 41 was permitted to elevate the-shunt contacts 38 and 39, unhinnee tiered hythe electrical attraction of the magnet 47 upon the armature 41, which is connected to and formsa part ofthe ewingspring 41' was permitted to cause the pin 38 to pass'through the slot 55 above referred to.

In order to keep the calling substation instrument No. 1, from being shunted by the action ofthe disk 36, in such instrument when the disk was rotated, and at theitime substation No. 5 was selected by the exchange station, it'will be observed that the receiver being from the hook in substation No. 1 will cause the closure at contacts 61 and 62by the receiver hook 25, and thus a circuit, as will presently appear, to the elec'tromagnet 47 was closed, so as to attract the armature il and move the contacts 38 and 39 against the. action of the spring 41',

, to cause the pin 38 to be prevented from enbe held below ridge -'and thus open the shunt contacts 38 and 39 tering-the slot thus causing the same to a as long as properly operated. Thus it will be seen that the calling substation can be placed in communication with-any of the substations controlled from the exchange station, and that the opened at the calling substation No. '1 as the projection 38 will ride upon the ridge a so that conductors 42-43% the calling sub- :station are connected to the line L-L as in'my former Patent No. 1,061,285. Thus the calling substation will have its disk 36 in such position that the release of the selectingkey Is at the exchange station, as set forth in the above mentioned patent, will permit of the return of the disk 36 to zero position, or to the position as shown in ig. 8.

The zero position here termed and regarded as slot 60, is one step in advance of 5 the normal position as shown in Fig. '8 of substation No. 1 and five positions in advance in'hll positions at substation No. 5 and soon.

,versation between substations No. 1 and No. 5 is at an end, the receivers in both substations will be placed uponthe hook and central will then remove .the calling plug 2 from-the calling jack 17 and thus as set forth in my Patent No. 1,061,286 permit the It will thereford be noted that. the wedge shaped projection 38 is placed .upon and carried by the disk 36 at .the substathat the party at substation No. I returned his receiver to'the hook after such conversation, the actuationof the disk 36 to zero position due to the automatic return of the selecting key, would cause the shunt contacts 38 and 39 in the substation No. l to cause the pin 38 to move under the ridge a at the slot 60, due to thefact that when the receiver was placed upon the hook, it closed contacts 77 and 78 and consequently the circuit to the electromagnet 47, and when the pin 37 passed the contacts 74: and '75 between theposition No. 1 and zero upon the calling substation, or adjacent the slot 55, the electromagnet 47 was energized and thus attracted the armature 41 to'cause the shunt contacts 38 and 39 to follow the dotted position as illustrated in Fig. 17, at which time the shuntswitch was permitted to open and thus permit thecalling substation to be connected to the .line for again signaling the exchange station.

The pin 38 at the substation No. 5 due to the fact that the receiver was left off of the hook, was caused to pass from below the ridge 38?, through the slots 55 and 57', as the circuit to the electromagnet {L7 in the substation No. 5 was not closed and therefore the shunt contacts 38 and 39 were moved by the spring 41' to assume the position as shownin dotted lines Fig. 11.

Should the substation N o. 5 with the parts in the position here described, be selected or called by exchange, the receiver being off of the hook, and the shunt switch 3839 being closed, the disk 36 would revolve and when the pin 38 has reached tooth 38" at position 60' ofthe disk, the shunt contacts 38 and 39 will be permitted to open due to the'sliding of the contacts upon the tooth 38, at which time, the call-up alarm contacts 85 and 90 would be closed and thus ring the alarm in the called substation No. 5, even though the receiver is not. upon the hook'and the hook 25' is elevated. This action will also cause the closing of the local talking circuit at contacts and 71-, the

engaging,

' sition, as shown in Fig. 10, the switch 85:

. receiver hook that the calling substation isdesired to be placed in communication thereappear strikes the contact 86' to ope'rate the pawl 02 and thus move the shunt contacts 3-839 fr 1 the groove 58 to'below the ridge.

a of the. disk 36, this action opening the contacts 86 and 90 and openihg the c1rcu1t to the call-up alarm 81 and leavlng the pin 38', to maintain the shunt switch 38-39 in substation Nb. 5. open with the contacts 70 and. 71 closed. Thus it will be seen that when the pin 38 is traveling in the groove 54: and engages'the tooth 38 at the substation called, the disk will be moved to poand 86 will be closed and the call-up alarm will be energized to indicate to' the called substation regardless of the position of-th'e with. It. will thus be seen, that provision is, madefor operating the call-up alarm switch 85, 86 and 90 r'egardlessof the position of the receiver in the called substation 'so that such substation may be properly connected and communicated with when de sired.

Shouldthe party at substation No. 5 at any time place the receiver upon the hook, the next time that the exchange operator actuates the disk 36 so as to place the same at zero position, the contacts 77 and 78 in substation No. 5, belng closed by the hook 25 the electromagnet 4 would be energized due'to the closure of the contacts 7 1 and 7 5 at the timethe in 37 on disk 36 passed the same, and aS such action moved the contacts '38 and .39 in the substation No. 5 against the action of-the spring 41, the ad justment of the block 40 by the armature 41 will cause the 'pin 38 to pass through the openings 57 .and to assume the positionbelow the ridge a at zero position, .or as clearly shown in Fig. 13.

By referring to Figs. 8 through'17, the

. selected, while in Fig. 11, the pin 38' is in the position it assumes, if the substation fails to place the receiver upon the hook at the end of thegconversatlon and the exchange operator has released the selecting key to-return the'disk to normal position.

In Fig. 12, the pin 38 is in the position it. would assume in the calling substation under the same conditions.

In Fig. 13, the pin 38 is in the position it would. assume which is the reverse of the position '11 and it had the-receiver been re:

turned to the hook;

F ig. leshows the-travel of pin 38 on disk 36. at all stations not selected Where the receivers are pro erly placed on hooks.

In Fig. 15, t e pin 38 is in the position with the contacts 38 and 39 opened it would assume had the-receiver been left off the hook when selected'and thesubstation selected by the exchange, while in Fig. 16 describes the pin 38' when the subscriber as in Fig. 15 hasplaced his receiver" upon the hook after the conversation and the exchange.

has returned the 'pin'to zero position.

In Fig. 17,, isillustrated, the path of the pin 38 when a selected substation as in Fig.

10 was moved to zero position.

In Fig. 18 the contacts 38 and.39 are in normal or shunt open position; Fig. 19, the position of the contacts 38 and39 closed in an uncalled substation, is illustrated; Fig. 20 the contacts 38-39 are shown open ina selected or called substation; while in Fig.

21, the contacts 38 and 39 are closed and in, the positlon' they assume when a substation leaves the receiver off the hook and is shunt-' ed'from the line, the disk 36 being in normal or zero position. I i

I The same action as regards the operation of the disk 36 iscarried out in th'einstallation as shown in' Figs, 3 and 4, the only difference being that the magneto A is dispensed with and the alternating current call up alarm generator G is installedat the ex change station E having the ground '9 at one terminal while the other terminal is connected through the signaling device 9 to the line, so that whenthe hook 25 in the substation is elevateddue to the receiver R being removed. therefrom, said hook will engage the contact 150, and thus connect the conductor 151 and'the ground g to the line L and thus cause the generator circuit with the'exchange to be closed and the consequent energiaation of the signal 9 to indicate thata substation is calling. By the insertion of the jack plug 1 inthe answering socket 14: at

the exchange station, the contacts 152 and 153 are openedand the current from the generator Gris shunted through the opposite coil of the signal 9 and grounded at g and thus entirely short circuited from the talking'circuit so as not to interfere therewith during the selecting and connecting of a calling to a called substation When the call-up magneto A in substation No. 1 as before, described was energized, the receiver being upon'the hook,.im-'

pulses were thrown upon the lines L-L through the conductors 3 and 4, and the condenser 6, said condenser. being pervious to the magneto and to the talking current and impervious to the battery current, the magneto current flowing through the conductor 7 and the lines L'--L' and the conductor 8 to the exchange signal 9, which is connected to the conductor 10, closed by the contacts 11 and 12. and-the conductor 13 to the line; Thus the exchange operator is notified that a substation desires to be communicated with, and the answering jack plug ljs now inserted within the socket 14, so that the substation is connected for the transmission of speech to the calling substation. The callingsubstation in the meantime having removed th receiver from the hook, has-its transmitter T properly connected in the usual manner so that the subscriber may inquire ofthe exchange operator the's'election 15 of a called substation. The answering jack socket-1 1 as illustrated-in both diagrams in F igs. 1 and 3, isconnected to the line L-L' through the conductors 15 and '16.

vAt'this'timefthe exchange operator inserts the calling jack plug 2 in one of the calling sockets -17, which closes the contacts 18 and 19 at the calling socket, and thus connects the exchange so that by the ma nipulation of the selecting key K'as par-.

ticularly set -'forth in my Patents Nos. 1,061,285 and 1,061,286 to throw impulses upon the line from the battery 23 to energize all of "the electromagnets 29 in every substation, thus imparting a proper stepby-step movement to the shafts and the respective disks 36 and 37. This action will cause the proper manipulation of the shunt contacts 38 and 39, and the other contacts 4445, 7071 and 74 and 75, 85-86 and 90 substations will tions. are again connected to the linefor so that the called substation will be, connected to the line L-L the shunt contacts 3839 open, while. the uncalled have the; shunt contacts 3838 held closed and thus be shunted from the line until the selecting keyK at the ex change has been released due to the removal of the .jack plug 2 from its socket 17 and the return to initial or zero position of the selecting key and consequently the stepby-step action imparted to the shafts 35 in all substations and the returning of the disks 36 and 37 to zero position so that all substacalling the exchange station;

The manipulation of the selecting key after the calling jack plug 2 is inserted in the socket 17 'will.cau'se the throwing upon the line of impulses from the battery 23 and to theeletromagnets 29,, each one of which is connected through the conductors 5 and? to the line LL in each substation. At this selecting key, in conjunction with the con tacts 11 and 12, are the contacts 2O which are operated by the selecting key as before stated, the automaticopening and closing of the same connecting and discbnnecting the battery 23 through thelc'on'duca tors 22,24 and 24' to the linecondlictor ilk-L and thus energizing allot-the elec rtromagnets 29. vI

placed upon the hook to establi ,When the receiver hook 25 is in its lowermost position, with the receiver R thereupon, the same completes the circuit with the line L. through the hook 25, the contact 26, the conductor 27, the bridging conductor 28, around the call-up magneto A, and the conductors 3, 4 and5, the condenser 6, and the conductor 7 to the line L at the opposite side of the substation.

hen the various electromagnets 29 in.

all of the substations are simultaneously energized, the armatures 30 are attracted against the action of their respectives-prings 30 and opei;a tes the"respective operating and arresting pawls 31-32, which in turn actuatethe respective operating and arresting ratchet-wheels 33 and 34, keyed upon the rotatable shafts 35; Each shaft in the present instance is carried by a base B, which is adapted to seal the lower end of the casing C of the desk instrument, as clearly shown in Fig. 5, said casing being so constructed, as "to permit -ofthe easyintroduction of the present substation device and the proper connection thereof so that the receiver hook rod 25 will be in ready. position to be moved into and out of engagement with the releasing pawl 86'86 which -per- 'mits of the readjusting of the shunt contacts 3839 when the subscriber at the substation has left the receiver from the hook and ,the same is called and the receiver is again sh'the proper connection with the line. Thus the present device is readily installed and positioned in place and due to the "spring 41' and the electromagnet' 47, the present mechacontacts 38 and 39 are operated by the peripheral-portion of the disk 36, the pin 38" thereof being adapted to follow the dotted position, as illustrated in Fig. 8 through 16 and thus consequently controlling the shunt contacts 38 and 39 according to the position of the receiver hook 25 and the receiver R in the substations.

. Disposed in the path to be engaged by the.

pin 37 of the disk 37, are two sets of contacts 44 a-nd 45,'an'd 74 and 75, the contact 44 having led therefrom, a conductor 46, whic'his connected to the receiver hook 25 at the contact 61, the receiver hook being disposed to bridge the contacts 61 and 62, and

thus complete the circuit through the conductor the electroma et 47 the con: 1 V 9 50 tacts 85-86 and 90 of the call-up alarm 81,

ductor 51, the battery 65, the conductor 53,

and the contact 45. Disposed to actuatethearmature 41 at the block 40, which is shifted so as to permit of the swinging of the contacts 38 and 39 and also contacts 70 and 71 and 85 and 86, transversely of the peripheral edge of the disk 36, so that said contacts 38 and 39'may be controlled for separation opposite direction. I The contacts 61 and 62 are disposed to be 1 or engagement,according to the desired condition, the circuit and the electromagnet 47 is provided to move the same in one direction while the spring 41' moves. it in the t the hook and the hook is permitted to the said contacts with the pin 38 below the elevate and thus close contacts 61-62. The

'energization of the electromagnet 47 will attract the armature 41 and cause the movement of the shunt contacts 38 and 39 in opposition tothe spring 41 and will place ridge a so that the contacts 38-39 are permitted to open and the substation is thus connected to the line.

As before stated, the periphery of the disk 36 is so mutilated or constructed as to provide the three circumferential ridges a, b and c, and to define the two grooves 54 and 58, the disk 36 also carrying thetooth 38 which is placed at position 60 as before set forth. The ridge a which is the lowermost ridge of the disk is provided with the slot 55-55 to form a. connection or communication with the recess or groove 54 and thus allow the means for permitting the pin 38 to move from below the ridge a into such recess 54. The ridge?) is provided with a slot 57' which permits the introduction or A movement of the pin 38' into the recess 58 all of which actions are due to the movement of the spring 41' when the disk 36 is rotated andthe electromagnet 47 is not energized. When the pin 38' is inposition. 60', the conaswell as the contacts 70-71 are closed, thus ringing the call-up alarm at the se lected substation. The pin 38 when passing through the grooves or slots 55-55 causes the contacts 38-39 to be moved transversely of the periphery of the disk 36, and asthe ridge 1) is provided with the slot 57' as before stated, the pin 38 is permitted to enter the groove 58 adjacent the ridge 0.

As may be found necessary and expedient, the disk 36 may be provided with any number of teeth 38, this being regulated according to the number of substations employed,

and each of said teeth as before described,

provides means for the control of the contacts 38-39, -71, and 85, 86 and 90, so

that the same may be properly opened and when the hook is elevated, the circuit thus formed comprising the conductor 64, the battery 65, the conductor 66, the transmitter T, the conductor 67, the induction coil 68, the conductor 69, the closed contacts 70 and 71, controlled by the shunt contacts 38 and 39, the 'conductor 63 and the contact point 50.

The contacts 70 and 71 are so' disposed with relation to the shunt contacts 38-39,

that the same will be open when the contacts 38 and 39 are cl0sed,-thus permitting the opening of the local battery circuit so that the manipulation of the hook 25 toelevated position will not cause the closure of such local battery circuit it being necessary that the contacts 38 and 39 be opened to permit the closure of the contacts 70 and 71 and thus properly connect the local battery circuit so that when the receiver hook 25 in the called or selected substation is elevated, the local battery circuit will be connect-ed to the line,exc'ept, when the pin 38 is standing in the groove 58 at zero or normal position.

The two spring contacts 74-75, whichare controlled by the pin 37 and are connected by means of the contacts 77-78, bridged by the receiver hook 25, at the time whenthe receiver hook is depressed and the receiver is thereupon,- will close the circuit to the electro magnet 47 through the conductor 51', the

electromagnet 47, the conductor 51, the battery 65, the conductor 65, the contacts 74 and 75, and the conductor 65 to the contact .78, this circuit providing means for returning the pin 38 to the proper groove of the disk 36. When such calling substation-has completed the conversation with the called substation, the receiver R is placed upon the hook and the selectingkey K at the exchange station has been manipulated by the rev moval of the calling plug 2 as before described, the disks 36 and 37 will be returned to initial or zero position and thus rotate the respective shafts 35 in all of the substations. This same condition is employed to return the pin 38 upon the groove 54, through the slot or recesses 57' or 55, when a party using an instrument has neglected to place the receiver upon the hook at the completion ofthe conversation, the spring 41' at this timehaving pushed the pin 38 I from the groove 54 tov the groove58, after the exchange operator has disconnected the calling substation by the return to normal position of the selecting key K.

tacts 85 and 86, the call-up alarm 81 will be energized through the following circuit:

The receiver hook 25, the contact 78, the conductor 80, the call-up alarm 81, the conductor 82, the battery 65, the conductor 64, the conductor 84:, the contact 86, the'contact 85, the conductor 87 and the contact 77. Thus the call-up alarm will be energized and will l/ remain energized until the receiver is removed from the hook to permit the elevation of the same and the opening of the call-up alarm circuit at contacts 77-7 8, or as particularly set forth in my co-pending application filed April 9, 1912, Serial No. 690,014, renewed August 20, 1913, Serial No, 7 85,818, the said alarm in this instance as herein noted, being controlled by the local battery-or a battery at the substation and being so constructed as to prevent the manipulation thereof accidentally caused by the engagement of thetooth 38 when returning the disk 36 to zero position. j Should the subscriber at the called substation for any reason have left the receiver R off of the hook, the hook will thus be ele-a vated and the circuit to the call-up alarm 81 at contacts 77 and 78 will' be open, but when the disk 36 has been rotated through the se lecting key from the exchange station, just as the pin 38' reaches a position approximately at zero or initial position, the spring 41', not being opposed by the electromagnet 47, will cause thepin 38topass through the recesses and 57, or as clearly illustrated in Fig. 11 so that the next time that the substation is called by the exchange station, the pin 38 owing to the party not placing the receiver upon the book, will be caused to travel in the groove. 58, so that when .the pin 38 arrives at the tooth 38, the contacts 38*39 will open, and the contacts 85 .and 90 willclose so'that the callup alarm 81 will be energizedthrough the following circuit: The contact 90, the conductor 91, the a arm 81, the conductor. 82, the battery 65, the conductor 64, the conductor'84, and the contact 86. Thus it will be seen that the alarm 81 y will continue to ring similarly to the before mentioned ringing when the receiver wason the hook, thus providing a means for the calling of a substation regardless of the position of the, receiver hook.

The contacts .86 and 90 are operated by the. spring contact '85, disposed over the contact 38 of the shunt connection, sothat when I the shunt connection is closed at contacts 38 "and 39, the contacts 85, 86 and 90 will be opened, except when the pin 38 is standing in the groove 58 at position 60. Thus the uncalled substations will' beshunted from the line and will also have the circuit controlling the call-up alarm open, especially at contacts 86 and 90, so that such call-up alarm circuit cannot be operated until the shunt contacts 38 and 39 are opened.

The rod25' which as shown in Fig. 5 is mounted for vertical sliding movement within the standard of the. desk outfit, has its end 25 so disposed, that when the receiver.

R is placed upon the hook 2 5, the rod will move downwardly and cause the pawl 86' to adjust contacts 38 and 39 from the groove 58 to the groove 54:, the same action of the receiver rod thus placing the contacts 38-39 in position 60.

When the receiver hasbeen left from the hook, the pin 38 is pushed to the groove 58 by the spring 4:1 as just described, and the contacts 38-39 will cause the opening of the talking circuit at 70-71 and the alarm circuit at contacts 85 and 90.

The party wishing to call the exchange station observing the mistake that the receiver has been left from the hook and the pin 38 at this time being in the groove 58 at zero position, said party will vlbrate the hook and consequently the rod 25 so that the tooth 86' will operate the pawl 12, placing the pin 38 below ridge a and thusseparating the contacts 38 and 39 and connecting the substation directly to the talking circuit. If such substation is called when the receiver is thus being adjusted, the disk 36 and contacts 85 and 90 will be moved and the pin 38 will be placed at position 60' of the disk and the call-up alarm circuit will be closed while the talking contacts 70 and 71 of the shunt contacts 38 and 39 will be opened.

In Figs. 24 and 25, the pawl 86 is a curved plate mounted for sliding movement upon and carried by the disk 36. The hook rod engaging end 6 is pivoted for lateral movement so that any fixed portionof the lockout device struck the end 25" of the rod 25 during the rotation of the disk 36 will not Slide the pawl. The beveled end f however, when engaged by the end 25" of the rod 25 when the rod is lowered, imparts sliding movement to the pawl 86 against the action of the spring 9" so that the free end of the pawl 86 will engage the upper edge of the contact 38 and thus push said contact 38 and moved to the desired position. The contacts 101.'102 are disposed .in the path to be actuated by the carriage of the selecting key'and connect through the medium of the conductor 103, the normally closed contact 104 of the calling socket 17 through the conductor 105 which is connected to the normally closed contact 106 of the answering socket 14 and the conductor 107 with the battery 93. The circuit being accomplished through the conductor 100, the electromag.

net .99, the conductor 98, the conductor 97 and the contact 101. Thus the contacts 95 and 96 and 101 and 102 control the energization of the electromagnet 99.

In order to provide a signaling means at each substation so as to indicate when the line is busy, by the disk 37 keyed upon the upper end of the shaft 35 and disposed in the path of this segmental ridge 155, is a pair of spring contacts 157 and 158, which constitute thesWitch for the circuit including such contacts, the conductor 159, the battery 160, the signal light 161, and the conductor 162.

hus at any position except zero position,

the switch is closed and the signal light energized, the recess formed by the mutilation of the ridge 155 causing the opening of the switch and this action being at zero position.

- This signal light is of an exceedingly low voltage, and is disposed within the caslng C and readily observable through the observation aperture formed therein.

In order to provide a means, whereby a conversation may be recorded, especially in the case where sent, a. talking machine M, either in the form of a mechanical machine as the dictaphone or the telegraphone may be employed, the circuit for controlling the starting and stopping of the same being actuated by the pin 37* of the disk 37 through the switch 163-164 which is only permitted to be closed when the-receiver is off of the hook, the subscriber notifying the exchange before doing so, so that the exchange when calling the subscriber or connecting him to a 1calling substation can notify the calling substation that the party is absent but that the recording machine can be connected so that the message may be impressed therethat the a segmental ridge 155 is carried the called subscriber is abfscriber from upon either mechanically as in the dictaphone or electrically as in the telegraphone.

This circuit includes the clutch mecha-' nism 165, controlled by the electromagnet 166, the conductor 167, the battery 160 and the contracts 163-164. 3-

Where the telegraphone is employed, the record is recorded magnetically upon a magnetizable wire, or where the dictaphone is employed, the usual wax cylinders maybe employed, and constructed so that several in succession may be connected to record a com lete message or messages.

,W here the telegraphone is employed, the coil for recording the message is connected directly to the talking circuit and thus is in series. or multiple with the receiver R while where the dictaphone is employed, 'the' receiver may be positioned when removed from the hook directly in the horn thereof, the present invention residing in the fact A light wire X, that carries a very small amperage as for instance, the talking current of 24 volts and 2 amperes is employed to form a path for the talking current and thus assists in preventing the actuation of the electromagnet 29 by the-talking current when the exchange operator has connected the talking circuit to the line. In fact any means that will form the desired'path for the talking current may be used. 'It will be noted that the electromagnet 29 is connected to the line at all times even though the shunt contacts 38 and 39 would be closed. The battery 23 will intermittently energize the electromagnet 29 when the contacts 38 and 39 are closed, through the following circuit: the battery 23, the conductor 24, the line L, theconductor 43, contacts 38 and 39, the conductor 42, the conductor 4, the'conductor 4, the electromagnet 29, the conductors 7 and 7, the continuation of the lineLL, the conductor 24, the contacts 20 and 22 Therefore as the battery is connected to the line, its amperage being greater or hav-- ing different characteristics than the talking battery, will energize the electromagnet 29 and step the shaft 35.

In the magneto call systems as shown in control of the telegraphoneor dicwhen the receiver is from the hook 21, and the battery Figs. 1 and 2, in order to prevent thesubremoving the receiver and ermit'ting the elevation of the hook- 25, Without ringing the magneto, an armature lock 168, is provided to normally seat in a recess in the rod 25, and hold. the same in lowermost position. In order to provide a release for the lock 169, by means of the conductors 170 and 171 is. connected to receive current from the 168, an electromagnet 1,eea,7ea

magneto, which is operated after the calling subscriber has raised the receiver or re- .leased it from the hook '25. Thus the bell or signal 174,, controlled by the signal device,

and contact 17 3 to receive current from the alternating current generator G, at the exchange station is provided;

The arrangement here shown and de-. scribed provides for the shunt contacts, 38 39 to contact the contacts 70-71 and all of the others associated therewith as illustrated in Fig. 7. This feature is not shown in my former Patents N 0. 1,061,285 and No.

What is claimed is:

1. In a selective system of telephony, the combination of an exchange station and a plurality of substations connected electrically for the transmission of intelligence, said exchange station having a selecting and each substation having a receiver, a battery, a local circuit including the battery, a transmitter in said local battery circuit, a shunt connection with the line provided with a switch, an electro-magnet influenced by the selecting device, means controlled by the electro-magnet for open ing and closing the switch of the shunt connection, and a switch in the local battery circuit controlled by the shunt connection switch, whereb the local battery circuit is open when the s unt is closed, and vice versa.

2. In a selective system of telephony, the combination of an exchange station and a plurality of substations connected electrically for the transmission of intelligence, said exchange station having a selecting. device, and each substation having a receiver,

a battery, a local circuit including the bat tery, a transmitterin said local battery circuit, a shunt connection with the line provided with a switch,,an electro-magnet influenced by the selecting device, means controlled by the electro-magnet for opening and closing the switch of the, shunt connection, a switch in the local battery circuit controlled by the shunt connection switch, whereby the local battery circuit is open when the shunt switch is closed, and vice versa, a call-up alarm, a circuit including said battery and the call-up alarm, and a switch in the last circuit controlled by the shunt connection switch, the same being opened when the shunt connection is closed, and vice versa.

3. In a selective system of telephony, the combination of an exchange station and a plurality of substations connected electri v cally for the transmission of intelligence, said exchange station having a selecting (levice, and each substation having a receiver, a battery, a local circuitincluding the bat tery, a transmitter in said local battery circuit,'a shunt connection with the line provided with a switch, an electro-magnet inwherebythe local battery circuit is open when the shunt switch is closed, and vice versa,'and means controlled by the electromagnet for regulating the position of the fluenced by the selecting device, means conshunt connection switch relatively to the controlling means thereof, and whereby the shunt connection switch may be operated when the receiver is upon, or off, its hook.

4. In a selective system of telephony, the I combinationof an exchange station and a plurality of substations connected electrically for the transmission of intelligence, said exchange station having a selecting device, and each substation having a receiver, a battery, a local circuit including the battery, a transmitter in said local battery circuit, a shunt connection with the line provided with a switch, an electro-magnet influenced by the selecting device, an intermittently operable means controlled by the electro-magnet for opening and closing the switch of the shunt connection, and a switch in the local battery circuit controlled by the shunt connection switch, whereby the local battery circuit is open when the shunt switch is closed, and vice .versa..

5. In a selective system of telephony, the combination of an exchange station and a plurality of substations connected electrically for the transmission of intelligence, said exchange station having a selecting device, and each substation having a receiver, a battery, a local circuit including the battery, a transmitter in said local battery circuit, a shunt connectionwith the-line provided with a switch, an electro-magnet' influenced by the selecting device, an intermittently operable means controlled by the electro-Inagnet for opening and closing the alarm, a circuit including said battery and the call-up alarm, and a switch in the last circuit controlled'by the shunt connection switch, the same being closed when the shunt connection is opened, and-vice versa,

6. In a selective system of telephony, the combination of an exchange station and a plurality of substations connected electrically fol, the transmission of intelligence, said exchange station'havin'g a selecting de-' vice, and each substation havin areceiver, -a battery, a local circuit-including the batmittently operable meansc'ontrolled by theswitc thereof and :whereby the shunt connection 'switch may ,be operated when the receiver tery, a transmitter in said local battery circuit, a shunt connection with thegline provided with a switch, an electro-magnet influenced by the selecting device, an interelectro-magnet for opening and closing the switch-of the shunt connection, a switch in the-local battery circuit controlled by the shunt'connecti'on switch, whereby the last local battery circuit is open when the shunt 20 switch is closed, and vice versa, and means controlled. by the electro-magnet for regulatin the position of the shunt connection relatively to the controlling means is on, or oii, its book. v

7. In a'sele'ctive system of telephony, the

' combination ofjan exchange station'and a combination of an exchange station and a plurality of substations connected electrically for the transmission of intelligence, said exchange station having a selecting de vice, and each substation having a receiver, a

' receiver hook, a battery, a local circuitin-i cludi'ng the battery, a. transmitter in said local battery circuit, a shunt connection with the line provided with a switch, an electrof magnet-influenced' by the selecting device,

a stepbystep device controlled by the electro-magnet for opening and closing J the switch of the shunt connection, and aswitch in the local battery circuit controlled by the shunt connection switch, whereby the local batter circuit is open when the shunt l I switch isvc osed, and vice versa.

8. In a selective system of telephony, the

plurality ofsubstatio'ns connected electricall for the transmission of intelligence,- said exchange station having aselecting device, and each substation having a receiver,

areceiver hook, a battery, a-local circuit in{ cluding the battery, a'transmitter in said local battery circuit, a shunt connection-with the,

line provided with a switch, an electro-magnet influenced by the selecting device, a step-by-step device controlled by the electromagnet for opening and-closing the switch of the shunt connection, a switch" in thelocal battery circuit controlled byctheshunt connection switch, whereby the local battery circuit is open when the shunt switch is closed, and vice versa, a call-up alarm, a cirl cuit including said battery and the call-up alarm, and a switch in the last'circ'uit controlled :by-the shunt connection switch, the

same being closed when the shunt connectionv is opened, and vice versa.

9.,In a selective system of telephony, the

combination ofan exchange station and a plurality of substations connected electricaiiiy for the transmission of intelligence, sa1

device, and each substation having a-y'receiver, a receiverfhook, a battery, a local circuit including the battery, a transmitter v .in saidvlocal battery circuit, a shunt connec- ,tion with the line provided with a switch,

exchange station having a selecting an electro magnet influenced by the selecting device, -a step-by-step device controlled by shunt connection swltch relatively. to the controlling. means thereof, and whereby the shunt connection "switch may .be operated when the receiver is upon, or off, its book.

10. -A substation, including a shunt connection' with the line, a switch in said connection, a battery, a circuit including saidbattery, a transmitter in said circuit,"a receiver, a receiver hook, said receiver hook being disposed to bridge saidcircuit when elevated, a switch in said' circuit controlled by the switch of the shunt connection, such switch being open when the shunt switch is closed.and vice versa, and means, in-

l1ne for-operating the fluenced from the shunt switch. v

"11. A substation, including a. shunt 'con- :nection with the line, a switch in said con- 'nection,"a lbattery, a circuit including said battery, a'transmitter in said circuit, a receiver, a receiver hook, said-receiver hook being disposed to bridge said circuit when elevated, aswitch in said circuit controlled by the ,switch of the shunt connection, such switch being open when the shunt switch is a circuit including said battery, the last switch and the call-up alarm'switch:

'nection with the line, a switch in said connectionfa battery, a c rcult including said battery, a transmitter in said circuit, a recelver,

and the call-up alarm,'-and means influenced. from the line for operating the shunt switch 12. A substation,"including a shunt 'conclosed and v1ceversa,a call-up alarm, a switch, l

a receiver hook, said'receiver hook being dis posed toibridge said circuit when elevated, a

switch in saidcircuit controlledby the switch of'theshu'ntconnection, such switch 1 being-open 'whenthe shunt switch' is closed and'viceversa, acall-up alarm, a switch, a

circuit including said battery, the last switch and the call-up alarm,':and-1 'neans in-' fiuenced from the line for shunt switch'and the call-up alarm switch, .the receiver hook, when. th

. up alarm circuit may operating the e receiver is thereupon,- being a bridge in the call-up alarm circuit, whereby the call-up alarm circuit is open when the receiver is removed.

13. A substation, including a shunt conneca switch in said connection, a battery, a circuit including said battery, a transmitter in said circuit, a receiver,a'-receiver hook, said receiver hook being disposed elevated, a switch in.sa1d circuit controlled by the switch of the shunt connection, such switch being open 'when the shunt switch is closed and vice versa, a. call-up alarm, a switch, a circuit including said battery, the last switch and'the call-up alarm, means influenced from the line for operating the shunt switch and the call-up alarm switch, the receiver hook, when the receiver is thereupon, being a bridge in the call-up alarm circuit, whereby the call-up'alarm circuit is open when. the receiver is removed,-and means for controlling the shunt switch, whereby when the receiver is ofl the hook the call-up alarm circuit may be energized. 14. A substation, including a shunt connection with the line, aswitch in said con nection, a battery, a circuit including said battery, a transmitter in said circuit, a. re ceiver, a receiver hook,said receiver hook being dlsposed to bridge said circuit when tion with the line,

elevated, a switch in said'circuit controlled by the switch of the shunt connection, such switch being open when the shunt switch is closedand vice versa, a call-up alarm, a switch, a "circuit including said battery, the

last switch, and the call=up alarm, means influenced from the line for. operating the shunt switch and the call -up"alarm switch, the receiver hook, when the receiver is thereupon, being a bridge in the call-up alarm circuit, whereby the call-up alarm circuit is open when the receiver is removed, means for controlling the shunt switch, whereby when the receiver is 01f the hook, the callbe energized, and means controlled by the receiver hook for operating the shunt switch to open the callup alarm circuit after the last circuit has been thus energized. V p

15. A substation, including a shunt connection with the line, an oscillatory switch in said connection, a battery, acircuitincluding said battery, a transmitter in said circuit, a recelver, a. receiver hook, said recircuit when elevated,

ceiver hook being disposed to bridge the a switch in said circuit; controlled by the switch of the shunt .connection, such switch being openwhen the shunt switch is closed and vice versa,

- means having a plurality of switch controllingmeans influenced from the line for operating the shunt'switch, and a sprlng and to bridge said circuit when.

alarm, means influenced from tl operatlng the shunt switch and in said connection,

the receiver hook, when the electromagnetically actuated means controlled by said last means for oscillating the shunt switch to select a controlling means therefor.

16. A substation, including a shunt connection with the line, an oscillatory switch in said connection, a battery, a circuit including said battery, a transmitter in said circuit, a receiver, a receiver hook, said receiver hook being disposed to bridge the circuit when elevated, a switch in said circuit controlled by the switch of the shunt connection, such switch being open when the shunt switch is closed and vice versa, a callupalarm, a switch, a circuit-including said battery, the last'switc'h, and the call-up 1e line for the call-up electromagcontrolled bysaid the shunt switch to alarm switch, and a spring and netically actuated means last means for oscillating select a controlling means therefor.

17. A substation, including a shunt connection with the line, an oscillatory switch a battery, a circuit including said battery, a transmitter .in .said circuit, a receiver, a receiver hook, said receiver hookbeing disposed to bridge the circuit when elevated, a switch in said circuit controlled by the switch of the shunt connection, such switch being open when the shunt switch is closed and vice versa, a call-up alarm, a switch, a circuit including said battery, the last switch, and the call-up alarm, means influenced from the line for operating the shunt switch and the callup alarm switch, and a spring and electromagneti cally actuated means controlled by said last means for oscillating. the shunt switch to select a controlling means therefor, the receiver hook,.when the receiver is thereupon, beinga bridge in the call-up alarm circuit, whereby the call-up alarm circuit is open when the receiver is removed.

18. A substation, including a shunt connection with the line, an oscillatory switch in said connection. a battery, a circuit including said battery, a transmitter in said circuit, a receive jh receiver hook, said receiver hook being disposed to bridge the circuit when elevated, a switch in said circuit controlled by the switch of the shunt connection, such switch being open when the shunt switch is closed and vice versa, a call-up alarm, a switch, a circuit including said battery, the last switch, and the call-up alarm, means influenced from the line for operating the shunt switch and the 'call-up alarm switch, and a spring and electromagnetically actuated means controlled by said last means for oscillating the shunt switch to select a controlling means therefor, receiver is there upon, being a bridge in the call-up alarm circuit, whereby the call-up alarm circuit is Y ceiver hook being disposed to" bridge the circuit when elevated, a 'switchin said'circuitcontrolled by the switchof the shunt connection, suchswitch'being open when the shunt switch is-closed and vice versa, a call-up open when thereceiver is removed, onset the plurality of means for controlling the. sliunt'switch permitting the call-up alarm.-

circuit to be energized when the receiver is off the hook,. n r 19."A substation, including a shunt.con-. nection with, the line, an oscillatory switch in said connection, a battery, a circuit ina transmitter in said eluding said battery,

hook, said recircuit, a receiver, a receiver alarm, .a -switch, a circuit including said battery, the last switch,iand thecall-up alarm, means influenced from the line for operating the shunt switch and the call-up alarm switch, a spring and electromagnetically actuated means controlled by saidlast means for oscillating theshunt switch toselecta controlling means therefor, the receiver book when the, receiver is thereupon, being a bridge in the call-up alarm circuit, where-' c by the call-up alarm circuit is open when switch to open the 'call up alarm '30 thQ I'QCBiVQI is removed, and means controlled by the receiver hook the last circuit has been thus energized.)

' nection with the line, a swingingly mounted.

' switch in said rod carried by the connection, a battery, a ci rcuit including saidbattery, a transmitter in said circuit','-a receiver, a receiver book, a hook, said receiver hook being'dispos'ed to elevated, aswitch in said circuit controlled by theswitch of the shunt connection, such switch being open when the shunt is closed and vice versa, a rotary disk having a plu- .rality of selective switch controlling means, means for actuating the disk, from a distant 4 point, and means for operating and swinging the shunt switch to ,place the switch in selected position relatively to the switch con} trolling means of the disk. 21. A substation, including a shunt "con nection with the line, a swingingly mounted switch in said connection, a battery, a circuit including said battery, a transmitter in 7 'said circuit, a receiver, a receiver hook, a

rod carried by the switch, said last means having a plurality ,of selective switch swinging means a controlled from the receiver is removed.

for operating the shunt circuit after 20. A substation, including a shunt c0nbridge the circuit. when a call-up the last switch, and the call-up alarm,

1,sea,"re2

( the line or the receiver hook r0d. v I

22. Asubstation, including a shunt connect-ion with the line, a swingingly mbunted' switch in said connection, a battery, a circuit including said battery, 'a transmitter in said circuit, a receiver, a receiver book, a rod carried by the hook, said receiver hook being dis'posed' to bridge the circuit when elevated,

a switch in said circuit controlled by the sw tch of the shunt connection, such switch being open when the shunt switch is closed and vice versa,'a call-up alarm, a switch, a:

circuit including said battery, the last switch, and the call-upialar'm, ,means influenced from the linegforoperating the shunt switch and the call-up alarm switch, said last means .having a plurality of selective switch swinging means controlled from the line or'by' the receiver hook rod, the receiver hook when-the receiver is thereupon, being a bridge in the call-up alarm circuit, whereby'the call-up alarm circuit is open when 23. A substation, including a shunt: connection with the line, a swingingly mounted switch in said connection, a battery, a circuit including said battery, a transmitter in said circuit, a receiver, a receiver hook, a rod carried by the hook,-said receiver book being disposed to bridge the circuit when elevated,

a switch in said circuit controlled by. the i switch of the shunt connection, such switchv being open when the shunt-is closed and vice versa, a call-up alarm, a switch, a-circuitci'n- V clu'dingsaid battery, the last switch,-and the call-up alarm, means influenced from the line for 'operating'the shunt switch and the call-up alarm switch, said lastmeanshavin'g plurality of selective switch swinging-- means controlled from the line or by the receiver hook'rod, the receiver hook when the receiver 15 thereupon being a bridge in the call-up alarm-circuit, whereby the callup-alarm circuit is openwhen the receiver is removed,- one of the plurality of selective switch swinging vmeans for controlling the shuntswitch permitting the call-up alarm, circuit to'be energized whenthe receiver is off the hook.

24:. A substatiomincluding shunt con nection with the line, a swingingly mounted switch in said connection, abattery, a circuit including said battery, a transmitter in said iit circuit, a. receiver, a f receiver hook, a rod I disposed to bridge the'circuit when elevated, a switch in said, circuit controlled by theswitch of the shunt connection, such switch being open when the shunt switchis closed and vice versa, a call-up alarm, a switch, a

ci'cuit including said battery, the last sw tch, and the'call-up alarm, means influenced from the line for operating the .shunt switch and the call-upalarnilswitch,

said last means having a plurality of selective switch swinging means controlled from the line or by the receiver hook rod, the receiver hook when the receiver is thereupon being a bridge in the call-up alarm circuit,.

whereby the call-up alarm circuit isopen when the .receiveris removed, one of the plurality of selective switch swinging means for controlling the shunt switch permitting the call-up alarm circuit to be'energized when the-receiveris off the hook, the receiver hook rod being controlled by the receiver hook for operating the shunt switch to open the call-up alarm circuit after the last circuit has been thusenergized.

- 25. In a selective telephone systemyan exchange station and a plurality of substations connected electrically for the transmission :of intelligence, each substation including a tubular support, a casing carried at the lower end thereof, a receiver hook mounted in said support, a rodcarried thereby and extending through the tubular support into the casing, and a lookout device insertible within-the casing and having a base sealing the same.

26. In a selective systemof telephony, the combination of an exchangestation and a plurality, of substations connected electrically for thetransmission of intelligence,

said exchange station having a selecting device, and each substatlon having an electromagnetically actuated shunting (device, a transmitter, a receiver, a receiver hook, a re ceiver hook lock normally locking the hook when the receiver is thereupon, a'call-up magneto, an electro ma'gnet in circuit with the magneto for releasing the lock when the substation is signaling the exchange, and

means for mechanically releasing the lock operated by the shunting device as the substation is selected from the exchange station.

27. In a selective telephone system, an exchange station having a selective device, a plurality of substations, a receiver hook 1n each substation, a rod depending therefrom,

a resilient lock in the path thereof to engage the rod and lock the hook against elevating, a magneto at the substation, and an electromagnet in circuit with the magneto and for operating the lock to release the rod -and hook.

28. In a selective telephone system, the combination of an exchange station having a selecting device, and a plurality of sub-stations connected electrically 'with the exchange station, each of said sub-stationsjhaving a step-by-step device, a sound recording mechanism, a releasing device for the sound record mechanism biased in' one direction,

an operating device for the releasing device RUBEN o. M. HASTINGS.

Witnesses:

'SELIN WILLsoN, DAVID P. MOORE. 

